JPH01269214A - Manufacture of magnetic head - Google Patents

Abstract

PURPOSE:To obtain a head, which has a desired gap depth, by adhering a core chip and a slider, after that, shaving the slider and executing the grading of the slider and core chip while an apex part is confirmed. CONSTITUTION:A magnetic substance block is worked and a read write core 21 and an erase core 22 are formed. Then, the erase core 22 is fixed from both sides of the write core 21 and a core chip 24 is made. A slider 23 of a nonmagnetic ceramic material is attached to both sides of this chip 24. Next, a side surface 23a of the slider 23 is shaved up to a position, where an apex part 24a of the core chip 24 can be observed, in a direction vertical to the side surface 23a and a reinforcing member 26 to be composed of a nonmagnetic substance is adhered over a slit 25 which is formed by shaving work. Next, a sliding surface 27 with a magnetic recording medium is ground while the apex part 24a of the core chip 24 is observed by a microscope, etc., through the slit 25 and a desired gap depth Gd is obtained. After that, a read write coil 28 and an erase coil 29 are mounted, a back bar 30 is adhered and a mag netic head is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method of manufacturing a magnetic head used in a magnetic recording/reproducing device.

2. Description of the Related Art A conventional magnetic head, for example a tunnel erase type, has a structure as shown in FIG. This will be explained below using FIG. 2.

In Fig. 2, reference numeral 1 indicates a read/write core made of a magnetic material such as ferrite, and erase cores 2 are arranged on both sides of this read/write core. A formed slider 3 is arranged. Note that the read/write coil and erase coil are not particularly shown in this figure. Next, a part of the manufacturing process of the magnetic head having the above structure will be explained with reference to FIG.

First, a magnetic block is subjected to various processing to produce the results shown in Figure 3 (a).
) Read/write core 1 and erase core 2 shown in
The erase core 2 is fixed from both sides of the read/write core 1 as shown in the same figure (b), and the core chip 4 is
get. Then, the gap depth Gdl at this point is measured using a microscope. Next, as shown in FIG. 4(c), sliders 3 made of non-magnetic ceramic are attached to both sides of this core chip 4. Then, based on the value of the gap depth Gdl that was previously measured, the media sliding surface was ground by the difference from the desired gap depth Gd, and the magnetic Get the head.

Incidentally, the efficiency and characteristics of a magnetic head are determined by the magnetic resistance of the gap portion. Therefore, the gap length and gap depth must be processed with high precision.

Since the gap length is exposed on the sliding surface with the magnetic recording medium, it can be measured using a microscope or the like, so its management is easy.

However, according to the conventional manufacturing method described above, the sliding surface with the magnetic recording medium is ground based on the gear/tube depth Gdl measured on the core chip alone, and the actual Since the gap depth cannot be measured, the completed magnetic head contains both a measurement error when measuring the gap depth Gdl and an error in the amount of grinding when grinding the sliding surface. That will happen. Therefore, a problem has arisen in that the gap depth Gdl of the finished magnetic head has a large variation.

Therefore, the present applicant has devised a method for manufacturing a magnetic head in which the core chip is sandwiched between sliders, and then the slider and core chip are ground from the side opposite to the sliding surface with the magnetic recording medium to obtain the desired gap depth. Ta.

This was something like this:

In other words, first, various processes are applied to the magnetic block and the fourth
The read/write core 11 and the erase core 12 shown in FIG. 3(a) are formed, and the erase core 12 is fixed from both sides of the read/write core 11 as shown in FIG. 3(b) to obtain the core chip 14. Then, as shown in FIG. 3C, sliders 13 made of non-magnetic ceramic are attached to both sides of this core chip 14. Then, the sliding surface with the magnetic recording medium is ground to eliminate unevenness on the surface.
Thereafter, as shown in FIG. 3(d), the slider 13 and the core chip 1 are removed from the side opposite to the sliding surface 15 with the magnetic recording medium.
4 to obtain the desired gap depth Gd. In addition,
This cutting process is performed while observing the dimensions of the connecting portion 16 from both sides of the slider 13 using a microscope or the like. After cutting to the desired gap depth, the same figure (e)
As shown in FIG. 2, reinforcing members 17 made of a non-magnetic material are bonded to both sides of the slider 13 so as to straddle the slits 13a formed by the cutting process. After that, the same figure (
In this method, a read/write coil 18 and an erase coil 19 are attached as shown in (f), and a backper 20 is attached as shown in (g) of the same figure to complete the magnetic head.

Problems to be Solved by the Invention However, the method for manufacturing the magnetic head described above also has the following problems.

In other words, since both the slider and the core chip were ground from the side opposite to the sliding surface with the magnetic recording medium, as shown in FIG. Since a part of the magnetic head is removed by the cutting process, the completed magnetic head has a problem in that the strength of the magnetic gap portion is reduced.

Means for Solving the Problems In order to solve the various problems of the prior art described above, the present invention provides the following steps: After bonding the core chip and the slider, the apex portion of the core chip is bonded to a position where the apex portion of the core chip becomes visible from the direction perpendicular to the side surface of the slider. Grind only the slider from the side opposite to the sliding surface with the magnetic recording medium, and then grind the slider and core chip from the sliding surface of the magnetic recording medium while checking the apex part through this carved portion. The method includes a step of obtaining a magnetic head having a gap depth of .

Function: According to the manufacturing method described above, the pre-polishing work of the sliding surface with the magnetic medium can be performed while actually measuring the gap depth. Moreover, in this case, almost no gap reinforcing glass of the core chip is removed.

EXAMPLE Hereinafter, an example of the method for manufacturing a magnetic head of the present invention will be described with reference to the drawings.

Figure 1 is a diagram showing part of the manufacturing process of a magnetic head. First, various processing is performed on a magnetic block.
) are formed, and the erase cores 22 are fixed from both sides of the read/write core 21 as shown in FIG. 2(b) to obtain a core chip 24. As shown in FIG. 2C, sliders 23 made of non-magnetic ceramic are attached to both sides of this core chip 24. Thereafter, the core chip 24 is
until the apex part 24a of
The side surface 23a of the slider 23 is ground away from the side opposite to the sliding surface with the magnetic recording medium, resulting in the state shown in FIG. 4(d). Then, as shown in FIG. 4E, a reinforcing member 26 made of a non-magnetic material is bonded to the slider 23 so as to straddle the slit 25 formed by the cutting process.

Note that this reinforcing member 26 is attached to the uppermost end 25 of the slit 25.
It is glued at the part except for a. Thereafter, while checking the apex portion 24a of the core chip 24 through the slit 25 with a microscope or the like, the sliding surface 27 that contacts the magnetic recording medium is ground as shown in FIG. I can do it. After that, as shown in the same figure (g), the lead
A write coil 28 and an erase coil 29 are attached, and a backper 30 is adhered as shown in FIG. 3(h) to complete the magnetic head.

As described above, since the apex portion can be confirmed through the slit 25 provided in the slider, the dimensions of the gap can be determined while actually measuring the gap depth. Moreover, during this work, the gap reinforcing glass is hardly removed, so the strength of the completed magnetic head is not reduced.

Effects of the Invention As explained above, if the magnetic head manufacturing method of the present invention is used, processing can be performed while actually observing the gap depth part, so the manufactured magnetic head has good dimensional accuracy of the gap depth. Become something. Furthermore, since the gap reinforcing glass is hardly removed during the processing, the strength of the completed magnetic head is not reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view or side view of a magnetic head in several manufacturing steps in an embodiment of the magnetic head manufacturing method of the present invention; FIG. 2 is a perspective view of the magnetic head; 3 and 4 are perspective views or side views of a magnetic head at several manufacturing steps in a conventional magnetic head manufacturing method;
FIG. 5 is a side view of essential parts of a conventional magnetic head. 21...read/write core, 22...
・Erase core, 23...Slider, 24・
... Core chip, 24a ... Apex part, 25 ... Slit, 26 ... Reinforcement member, 27 ... Sliding with magnetic recording medium face, 2
8...read/write coil, 29...
・Erase coil, 30... Name of backbar agent Patent attorney Toshio Nakao and one other person Figure 1 m,... Figure 2 Figure 3 2 Figure 5

Claims (1)

[Claims] a first step of bonding sliders made of a non-magnetic material to both sides of a head core chip made of a magnetic material and having a gap depth larger than the final gap depth;
A slit is formed in the slider toward the magnetic gap by cutting the slider from the side opposite to the sliding surface with the magnetic recording medium until the apex portion of the core chip becomes visible in a direction perpendicular to the side surface of the slider. In the second step, the slider and core chip are ground from the sliding surface with the magnetic recording medium while checking the apex part through the slit formed by the cutting process, and a magnetic head with the desired gap depth is prepared. A method of manufacturing a magnetic head, characterized in that: